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EASTERN SAND DARTER STATUS ASSESSMENT Prepared by: David Grandmaison and Joseph Mayasich Natural Resources Research Institute University of Minnesota 5013 Miller Trunk Highway Duluth, MN 55811-1442 and David Etnier Ecology and Evolutionary Biology University of Tennessee 569 Dabney Hall Knoxville, TN 37996-1610 Prepared for: U.S. Fish and Wildlife Service Region 3 1 Federal Drive Fort Snelling, MN 55111 January 2004 NRRI Technical Report No. NRRI/TR-2003/40 DISCLAIMER This document is a compilation of biological data and a description of past, present, and likely future threats to the eastern sand darter, Ammocrypta pellucida (Agassiz). It does not represent a decision by the U.S. Fish and Wildlife Service (Service) on whether this taxon should be designated as a candidate species for listing as threatened or endangered under the Federal Endangered Species Act. That decision will be made by the Service after reviewing this document; other relevant biological and threat data not included herein; and all relevant laws, regulations, and policies. The result of the decision will be posted on the Service's Region 3 Web site (refer to: http://midwest.fws.gov/eco_serv/endangrd/lists/concern.html). If designated as a candidate species, the taxon will subsequently be added to the Service's candidate species list that is periodically published in the Federal Register and posted on the World Wide Web (refer to: http://endangered.fws.gov/wildlife.html). Even if the taxon does not warrant candidate status it should benefit from the conservation recommendations that are contained in this document. ii TABLE OF CONTENTS DISCLAIMER.................................................................... ii NARRATIVE .................................................................... 1 SYSTEMATICS ............................................................ 1 Common Name(s) ..................................................... 1 Scientific Name....................................................... 1 Taxonomy ........................................................... 1 PHYSICAL DESCRIPTION AND CHARACTERISTICS ........................... 2 BIOLOGY AND NATURAL HISTORY ......................................... 3 RANGE ................................................................... 5 Historical Distribution.................................................. 5 Current Distribution.................................................... 6 POPULATION ESTIMATES AND TRENDS ..................................... 9 SUMMARY OF THREATS .................................................. 16 Present or Threatened Destruction, Modification, or Curtailment of Habitat or Range 17 Siltation ...................................................... 18 Impoundment .................................................. 19 Stream flow modification ........................................ 19 Water quality .................................................. 20 Overutilization for Commercial, Recreational, Scientific, or Educational Purposes . 20 Disease and Predation ................................................. 20 The Inadequacy of Existing Regulatory Mechanisms......................... 21 Contaminated sediment guidelines ................................. 21 Other legislation................................................ 21 Other Natural or Manmade Factors Affecting its Continued Existence ........... 21 Genetic variation ............................................... 21 Lamprey control................................................ 22 CURRENT PROTECTIVE STATUS........................................... 22 SUMMARY OF LAND OWNERSHIP ......................................... 24 BENEFICIAL CONSERVATION ACTIVITIES.................................. 26 MANAGEMENT ACTION AND RESEARCH NEEDS ............................ 27 Taxonomic, Ecological, and Distributional Status ........................... 27 Habitat Protection and Restoration ....................................... 27 Translocation........................................................ 27 Monitoring.......................................................... 28 Watershed Management................................................ 29 LITERATURE CITED ............................................................ 30 INTERNET LITERATURE CITED.................................................. 37 APPENDIX 1.................................................................. 38 NARRATIVE SYSTEMATICS Common Name(s): eastern sand darter Scientific Name Ammocrypta pellucida (Agassiz) Taxonomy The eastern sand darter was originally placed in the genus Etheostoma by Baird in Putnam (1863) but was assigned to Pleurolepis pellucidus by Agassiz in Putnam (1863). Jordan and Gilbert (1882) then placed the species in the genus Ammocrypta since Pleurolepis was occupied by a genus of fossil ganoid fish (Linder 1959). Bailey and Gosline (1955) treated Ammocrypta as closely related to Percina, and had it consisting of two subgenera - Crystallaria, containing only A. asprella, and Ammocrypta, containing the remaining six species, all much smaller than A. asprella. Studies by Page and Whitt (1973a, 1973b) suggested that genus Ammocrypta was more closely related to Etheostoma than to Percina. Simons (1991) provided evidence that the morphological characteristics common to Ammocrypta and Crystallaria are a result of convergence rather than homology. Simons (1991) also asserted that the genus Ammocrypta (inclusive of C. asprella) is polyphyletic and that its smaller species (subgenus Ammocrypta) are more closely related to the Boleosoma group of the genus Etheostoma than to C. asprella. Therefore, Simons (1991) recognized Crystallaria as a valid genus, and treated Ammocrypta as a subgenus of Etheostoma. This designation has been adopted by some (Page and Burr 1991, Simons 1992, Wiley 1992), although others have retained Ammocrypta as a distinct genus (Etnier and Starnes 1993, Jenkins and Burkhead 1994), giving Crystallaria subgeneric status. Cladistic analysis of Ammocrypta and Crystallaria early-life stages by Simon et al. (1992), however, supported the elevation of Crystallaria to generic status, retained the former subgenus Ammocrypta as a valid genus, and suggested that the close relationship Simons (1991) noted between Ammocrypta and subgenus Ioa of Etheostoma is based on convergence rather than phylogeny. Molecular analysis by Wood and Mayden (1997), Song et al. (1998), and Near et al. (2000) show support for a monophyletic genus Ammocrypta that is sister to the genus Crystallaria and remote from Etheostoma subgenera Ioa and Bloeosoma. While the elevation of Crystallaria to generic status has been well accepted, the synonymy of Ammocrypta with Etheostoma has been followed by few, and will not be embraced in the forthcoming American Fisheries Society List of Common and Scientific Names (Joseph Nelson, chairperson, Names Committee, North American Society of Ichthyologists and Herpetologists/American Fisheries Society, pers. comm. with co-author D. Etnier). Williams (1975) described the confusion encountered with historical records thought to represent A. pellucida (e.g., Meek 1889, Evermann and Jenkins 1889, Woolman 1892, Fowler 1945) and concluded that they were more likely A. clara (western sand darter) or A. vivax (scaly sand darter). These closely related species have been considered subspecific to and/or synonymous with A. pellucida (Williams 1975). Linder (1959) distinguished A. pelludica from A. clara by the absence of the opercular (gill cover) spine, the greater number of scale rows, and a greater amount of pigmentation on the body, and treated the two as distinct species. Records of A. pellucida in the Mississippi River drainage north of the Ohio River confluence are referable to A. clara while records from the southern reaches of the Mississippi River drainage may represent 1 either A. clara or A. vivax (Williams 1975). Distributional overlap between A. pellucida and A. clara occurs in the Wabash (Indiana and Illinois), Cumberland (Kentucky), and Green (Kentucky) river drainages (Williams 1975). PHYSICAL DESCRIPTION AND CHARACTERISTICS The eastern sand darter is a member of the Perch family (Percidae) which contains such common game species as walleye (Stizostedion vitreum), sauger (Stizostedion canadense), and yellow perch (Perca flavescens). The family Percidae is a group of freshwater fishes characterized by the presence of a dorsal fin separated into two parts, one spiny and the other soft (Kuehne and Barbour 1983). The darters differ from their percid relatives in being much smaller and having a more slender shape. Darters have a reduced or vestigial swim bladder which decreases buoyancy, allowing them to remain near the bottom with little effort (Kuehne and Barbour 1983). Superficially, sand darters (genus Ammocrypta) resemble the crystal darter (Crystallaria asprella) (see Figure 1 in Appendix 1 - sketch by Samuel Eddy). However, they lack a premaxillary frenum and teeth on the palatine and prevomer. The two genera also differ in number of lateral-line scales and soft dorsal-fin rays (Stauffer et al. 1995). The eastern sand darter has an elongate body, generally about 50 millimeters (mm) standard length (SL) (Kuehne and Barbour 1983), and can reach a maximum of 70 mm SL (Page 1983). Williams (1975) described the eastern sand darter as the most elongate of the Ammocrypta species. The eastern sand darter lacks an opercular spine and has a single anal spine with 8 to 10 anal rays (Trautman 1981). The caudal fin is slightly emarginate
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